/*
 *    Thing Game Library
 *   Copyright (C)2005 - 2010 Eduardo Nunes Pereira (eduardonunesp at gmail dot com)
 *
 *   This program/library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 *   This program/library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 *    You should have received a copy of the GNU Lesser General Public
 * License along with this program/library ; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __MUTEX_HPP__
#define __MUTEX_HPP__

#include <SDL/SDL_thread.h>
#include "globals.hpp"

namespace Util
{
    struct Mutex
    {
        void lock();
        void unlock();

        Mutex();
        ~Mutex();

        private:
        Mutex(const Mutex&);  /* prevent copying */
        Mutex& operator=(const Mutex&);

        SDL_mutex *_mutex;
    };

    struct MutexLocker
    {
        MutexLocker(Mutex *mutex);
        ~MutexLocker();

        private:
        Mutex *_mutex;
    };


    inline Mutex::Mutex()
    {
        _mutex = SDL_CreateMutex();
    }

    inline Mutex::~Mutex()
    {
        SDL_DestroyMutex(_mutex);
    }

    inline void Mutex::lock()
    {
        if (SDL_mutexP(_mutex) == -1)
            Globals::logger->log("Mutex locking failed: %s", SDL_GetError());
    }

    inline void Mutex::unlock()
    {
        if (SDL_mutexV(_mutex) == -1)
            Globals::logger->log("Mutex unlocking failed: %s", SDL_GetError());
    }

    inline MutexLocker::MutexLocker(Mutex *mutex):
        _mutex(mutex)
    {
        _mutex->lock();
    }

    inline MutexLocker::~MutexLocker()
    {
        _mutex->unlock();
    }
}

#endif /* __MUTEX_HPP__ */
